Silicon block crushing method

Abstract

The invention relates to a silicon block crushing method, and particularly relates to a silicon block crushing method. The method comprises the following steps: putting bar-shaped silicon ingots cut by a sawing machine into material baskets, then putting the material baskets filling silicon block materials into a high-temperature resistance furnace, heating to high temperature, keeping the temperature for a certain period of time, taking all of the material baskets from the furnace, putting into a water tank filling with cold purified water, hoisting the material baskets when the silicon material temperature is reduced to water temperature, taking out the silicon blocks, and tapping by a hard alloy hammer, so that the silicon material crushed particle diameter is less than 300mm below. The silicon block crushing method provided by the invention can be used for improving the crushing efficiency and has no secondary pollution, and equipment is low in cost and has long service life.

Description

Technical field [0001] The invention relates to a crushing method, in particular to a silicon block crushing method. Background technique [0002] In the solar photovoltaic industry, directional solidification is the main method for preparing solar-grade polycrystalline silicon, that is, the segregation effect of elements is used in the solidification process to achieve the purification of polycrystalline silicon. However, the silicon ingot after directional solidification has a dense structure and high hardness, making it difficult to break. Most domestic and foreign manufacturers use hammer forging crushing, jaw crushing and other mechanical crushing methods to crush large silicon materials, and manually use cemented carbide hammers to further crush them. The method of crushing silicon material by this method has the following disadvantages: 1) Forging crushing, jaw crushing and cemented carbide hammer crushing, the material loss is large, and it is easy to introduce metal imp...

AI Technical Summary

Problems solved by technology

The method of crushing silicon material by this method has the following disadvantages: 1) Using hammer forging crushing, jaw crushing and cemented carbide hammer to crush, the material loss is relatively large, and it is easy to introduce metal impurities such as Fe for the second time, reducing the silicon material. 2) Because of the high hardness of silicon materials, it is difficult to crush, high labor intensity, low output, and extremely low efficiency; 3) The service life of crushing tools is short, resulting in increased production maintenance and cost

The above patents all use the method of mechanical crushing, without pre-processing the silicon material, so that metal impurities such as Fe will inevitably be introduced during crushing, which will pollute the silicon material. At the same time, due to the high hardness of the silicon material, the service life of the equipment crushing mechanism short, high maintenance cost

[0004] So far, there is no way to overcome the above drawbacks

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